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Current Report
Division of Agricultural Sciences and Natural Resources • Oklahoma State University
CR-2094
0510 Revised
Cotton Variety Tests, Oklahoma – 20091
Melanie B. Bayles
Cotton Variety Evaluation & Research Program Leader
Dept. of Plant and Soil Sciences
Oklahoma State University
Laval M. Verhalen
Professor Emeritus
Dept. of Plant and Soil Sciences
Oklahoma State University
Robert W. Thacker
Senior Superintendent of the Southwest Research and Extension Center, Altus, and of the Southwest Agronomy
Research Station, Tipton
Don W. Hooper
Senior Superintendent of the
South Central Research Station,
Chickasha
J. C. Banks
Extension Cotton Specialist and Director
of the Southwest Research and Extension Center, Altus, and of the Southwest
Agronomy Research Station, Tipton
Oklahoma cotton producers can increase their lint yield, fiber quality, or both by using varieties better adapted to their lo­cations and growing conditions. With the same inputs of capital and labor, some cotton varieties provide a much greater return on the producer’s investment than do others. The primary ob­jectives of the Oklahoma cotton variety testing program are to determine the relative performance of commercially available varieties when grown under Oklahoma climatic conditions and to distribute that information to cotton producers in the state. Results from this research should help producers, researchers, and extension personnel select better varieties.
Materials and Methods
In 2009, two irrigated cotton variety trials were planted on the Southwest Research and Extension Center near Altus. Dryland tests were grown on the South Central Research Station (Chickasha) and the Southwest Agronomy Research Station (Tipton). Soil types, planting dates, harvest dates, and cultural treatments for all tests are provided in Table 1. Since the ultimate goal of the variety testing program is to evaluate genetic differences among entries, all varieties (whether con­ventional or transgenic) within a test were treated the same with respect to production inputs including weed and insect control. Table 2 includes weather information extracted from Oklahoma Mesonet data for the locations where the tests were conducted (http://agweather.mesonet.org/index.php/data/section/climate). Degree-day 60 (DD60) data for specified time periods at those locations were determined using the cotton degree-day calculator available at http://agweather.mesonet.org/index.php/data/section/crop.
The experiments included varieties grown commercially throughout the Cotton Belt as well as advanced strains from various breeding programs. Because these tests are conduct­ed on a fee basis, some varieties currently on the market were not tested as the companies who own or market them chose not to participate. Some of the varieties and/or strains tested this year may not yet be commercially available, but possibly will be in the next year or two. The trials were conducted using randomized complete-block experimental designs with four replications. The test at Chickasha was analyzed as a com­pletely randomized experiment because some data had to be discarded due to production problems during the growing sea­son. Each plot consisted of four rows 30 feet long with 40 inches between rows. The two center rows in each plot were machine
1 Research in this report was conducted under Oklahoma Agricultural Experi­ment Station Project S-714 (Evaluation of Cotton Varieties for Oklahoma) by personnel in the Department of Plant and Soil Sciences and the Field and Research Service Unit, Oklahoma State University, Stillwater, OK 74078.
Oklahoma Cooperative Extension Service
Oklahoma Cooperative Extension Fact Sheets are also available on our website at:
http://osufacts.okstate.edu
Toby S. Kelley
Assistant Superintendent of the Southwest Research and Extension Center and the Southwest Agronomy Research Stations
Contents
Introduction.................................................................1
Materials and Methods...............................................1
Results and Discussion..............................................2
Lint Yield...............................................................2
Lint Percentages...................................................2
Fiber Properties....................................................2
Recommendations......................................................3
Acknowledgments......................................................3
Seed Sources.............................................................4
Tables
Test Locations and Production Information
for 2009.............................................................5
Weather Summaries at Each Location in 2009 ...6
Irrigated Test Results in 2009...............................7
Dryland Test Results in 2009................................9
Irrigated Test Results over Years........................11
Dryland Test Results over Years.........................14

Current Report
Division of Agricultural Sciences and Natural Resources • Oklahoma State University
CR-2094
0510 Revised
Cotton Variety Tests, Oklahoma – 20091
Melanie B. Bayles
Cotton Variety Evaluation & Research Program Leader
Dept. of Plant and Soil Sciences
Oklahoma State University
Laval M. Verhalen
Professor Emeritus
Dept. of Plant and Soil Sciences
Oklahoma State University
Robert W. Thacker
Senior Superintendent of the Southwest Research and Extension Center, Altus, and of the Southwest Agronomy
Research Station, Tipton
Don W. Hooper
Senior Superintendent of the
South Central Research Station,
Chickasha
J. C. Banks
Extension Cotton Specialist and Director
of the Southwest Research and Extension Center, Altus, and of the Southwest
Agronomy Research Station, Tipton
Oklahoma cotton producers can increase their lint yield, fiber quality, or both by using varieties better adapted to their lo­cations and growing conditions. With the same inputs of capital and labor, some cotton varieties provide a much greater return on the producer’s investment than do others. The primary ob­jectives of the Oklahoma cotton variety testing program are to determine the relative performance of commercially available varieties when grown under Oklahoma climatic conditions and to distribute that information to cotton producers in the state. Results from this research should help producers, researchers, and extension personnel select better varieties.
Materials and Methods
In 2009, two irrigated cotton variety trials were planted on the Southwest Research and Extension Center near Altus. Dryland tests were grown on the South Central Research Station (Chickasha) and the Southwest Agronomy Research Station (Tipton). Soil types, planting dates, harvest dates, and cultural treatments for all tests are provided in Table 1. Since the ultimate goal of the variety testing program is to evaluate genetic differences among entries, all varieties (whether con­ventional or transgenic) within a test were treated the same with respect to production inputs including weed and insect control. Table 2 includes weather information extracted from Oklahoma Mesonet data for the locations where the tests were conducted (http://agweather.mesonet.org/index.php/data/section/climate). Degree-day 60 (DD60) data for specified time periods at those locations were determined using the cotton degree-day calculator available at http://agweather.mesonet.org/index.php/data/section/crop.
The experiments included varieties grown commercially throughout the Cotton Belt as well as advanced strains from various breeding programs. Because these tests are conduct­ed on a fee basis, some varieties currently on the market were not tested as the companies who own or market them chose not to participate. Some of the varieties and/or strains tested this year may not yet be commercially available, but possibly will be in the next year or two. The trials were conducted using randomized complete-block experimental designs with four replications. The test at Chickasha was analyzed as a com­pletely randomized experiment because some data had to be discarded due to production problems during the growing sea­son. Each plot consisted of four rows 30 feet long with 40 inches between rows. The two center rows in each plot were machine
1 Research in this report was conducted under Oklahoma Agricultural Experi­ment Station Project S-714 (Evaluation of Cotton Varieties for Oklahoma) by personnel in the Department of Plant and Soil Sciences and the Field and Research Service Unit, Oklahoma State University, Stillwater, OK 74078.
Oklahoma Cooperative Extension Service
Oklahoma Cooperative Extension Fact Sheets are also available on our website at:
http://osufacts.okstate.edu
Toby S. Kelley
Assistant Superintendent of the Southwest Research and Extension Center and the Southwest Agronomy Research Stations
Contents
Introduction.................................................................1
Materials and Methods...............................................1
Results and Discussion..............................................2
Lint Yield...............................................................2
Lint Percentages...................................................2
Fiber Properties....................................................2
Recommendations......................................................3
Acknowledgments......................................................3
Seed Sources.............................................................4
Tables
Test Locations and Production Information
for 2009.............................................................5
Weather Summaries at Each Location in 2009 ...6
Irrigated Test Results in 2009...............................7
Dryland Test Results in 2009................................9
Irrigated Test Results over Years........................11
Dryland Test Results over Years.........................14